3√(-3 3/8) + 12 * 4√(7 58/81) = 18,5.

1) 3√(-3 3/8) = 3√ (-27/8) = 3√ (-3/2)3 = -3/2 = -1 1/2 = -1,5;

2) 4√(7 58/81) = 4√(625/81) = 4√ (5/3)4 = 5/3 = 1 2/3;

3) 12 * 5/3 = 12 * 5/3 = 60/3 = 20;

4) -1,5 + 20 = 20 - 1,5 = 18,5.